Method of forming and reenforcing flanged apertures in hollow bodies



Much 14', 1933. .1. H. TAYLOR 1,901,201

METHOD OF FORMING AND REENFORCING FLANGED APE-RTURES IN HOLLOW BODIESFiled Dec. 12; 1929 7*- 4 ..L. 4:54:44 [4.4.1. fames flall :7 yJOr-Patented Mar. 14, 1933 UNITED STATES PATENT OFFICE .11m HALL TAYLOR, 01OAK PARK,

ME'I'HdD OI FORMING AND REENTORGING FLANGED APERTUBES IN HOLLOW BODIESApplication filed Dccember lB, 1929. Serial No. 413,498.

This invention relates to a method for forming and reenforcing flangedopenings in hollow bodies.

In the manufacture of hollow bodies such as boilers or large pipes thathave to resist great pressures and that contain lar e openings, thediflicult problem hereto ore has been to properly reenforce the hollowbodies at such 0 enings to prevent rupture due to the great internalpressure. Generally, these openings are formed with an upstanding flangeand the greatest stress occurs at the margin of such opening or near thelower por to similar features in the diiferent views:

Figure 1 is a fragmentary vertical sectional view through a hollow bodyand reenforcing die member with the flanged hole forming mechanism shownin elevation.

Figure 2 is an enlarged fragmentary sectional view through the hollowbody with the reenforcing die member welded thereto.

Figure 3 is a sectional view through the combined reenforcing and diemember, upon a reduced scale.

According to this invention, a combined die and reenforcing member 1 isformed with a suitable base 2 to fit the curvature of the hollow body 3which may be a pressure boiler or pipe. The base 2 and the angle orelbow 1" thereof is made sufliciently durable and strong to withstandthe pressure-at the point of greatest stress. The reenforcing and diemember is formed with an interior bore which tapers upwardlyand inwardlyandis'of substantially frusto conical form. The upper part of thereenforcing die is in the form 50 of a flange 5 which forms a seat forthe usual in which similar reference numerals refer.

cover and also a seatfor the hole flanging apparatus.

- The flanging apparatus consists of a base" portion 6 adapted to restupon the flange 5,

and a fluid cylinder 7 which extends therefrom. A piston rod 8 extendsfrom this cylinder and this piston rod is provided with a flanging head9. The base 6 is adapted to be anchored to the hollow body by meansof astirrup 10 or the like. The flanging mechanism has not been fullyillustrated as such mechanism is old and well known.

In carrying out my method, after the reenforcing die is formed to resistthe greatest stress as above set forth it is superposed 35 upon thehollow body which usually has a small aperture to receive the pistonrod, the wall of such aperture isthen expanded or flanged against theinterior wall of the die L as shown in Figure 2 and this is done 1 by anupward movement of the flanging head 9.

As the flanging operation is carried out, theflange will stretchandbecome thinner toward its upper portion, and for this reason theinward taper on the reenforcing die has Q been provided. After theflanging operationhas been completed, the reenforcing die is welded tothe flange of the opening as indicated at 10, and the base flange 2thereof is j welded to the hollow body as indicated at 11.

It will be appreciatedthat the reenforcing die 1 due to its reenforcingbase flange 2 and the elbow 1* will effectively resist the criticalstresses which usually occur at the lower end of the opening and tend torupture the vessel. Further the weld 10 is above such elbow and avoidspractically all of the severe stresses in the liollow body.

Iam aware that many changes may be made and numerous details ofconstruction may be varied through a wide range without departing fromthe principles of this invention, and I therefore do not purposelimiting the patent granted hereon otherwise than necessitated by theprior art.

I claim as my invention:

1. The method of forming and reinforcing a flanged aperture in a hollowbody which consists in forming an aperture in said hollow body, forminga nozzle with a flange of increased thickness to' fit the curvature ofsaid hollow body adjacent said aperture, su erposing said nozzle uponsaid hollow y, flanging the wall of said aperture 5 agamst the. interiorsurface of said nozzle welding the. upper portion of said flan wall tosaid nozzle and the lower flange of said nozzle to said hollow body.

2. The method of f0 and reinforc- 10 ing aflanged aperture in aho 0wbody which consists in forming a combined die and reenforcing memberwith a thickened flange to .fit the hollow body and a central p with anenlarged lower tafered portion, 15 forming an aperture in sai hollowbody, superposing said member u u said hollow body, flanging the wall 0said aperture the wall of said enlarged tapered portion flush with theunenlarged pasage 20 in said member, and welding said flanged wall tosaid member and the flange of said member to said hollow body. Intestimony whereof I have hereunto subscribed my name,at Chicago, CookCounty,

26 Illinois. a

JAMES HALL TAYLOR.

